I think you are confusing concept and implementation.
It is quite clear that pretty much all of what you quote has been available for many OS's, with UNIX as one of them. For example, the segregation of authority has been in almost all multi-user OS's since computer-time began, and most implementations follow at least in part the Multics model. Ditto 'home' directories (and I can quote from direct experience VAX/VMS, RSX/11M, RSTS, PrimeOS, MTS, Harris VOS, AEGIS and Domain/OS [the earlier versions were UNIX like, rather than actual UNIX], and probably several I can't remember, and - of course - UNIX's from Bell Labs Version/Edition 6 onward and Linux)
In recent history, there has also been a common model of GUI, so I would not want to call whether GNOME/KDE was influence by Win95, with parallel evolution, or whether there is a common work-a-like (for example, whether both of them took anything from the Apollo/VUE/Motif/CDE developments). I certainly would not want to say that Windows 7 desktop was a copy of KDE any more than KDE being a copy of the Win95 desktop.
Many people who look at such things believe that the Genetic UNIX kernel (i.e. derived from AT&T code) has a number of fundamental deficiencies that need fixing by being replaced. Some, though not all, have been fixed in BSD derivatives and Linux, although both have other issues.
If you look at it, Rob Pike, Ken Thompson and Dennis Richie, all movers and shakers in original UNIX, have moved on, and developed (with others) Plan 9 as a replacement for UNIX.
Microsoft believed that they could develop a new OS from the ground up which would be better than anything then available. They did this by using IBM and people from other OS families (including Dave Cutler who was a VMS architect). Unfortunately, whether it was because of the short-sighted view of what it would be used for, or the requirement of backward compatibility with older OS's, Windows NT (new technology) and derivatives ended up where we are today.
If you look at the privilege separation, NT file system and multi-tasking ability compared with other OS's of the time (and Linux was not one of these), and integrated GUI, WinNT should have been quite a capable OS, but something important got lost along the way.
I blame the application model of being able to write where-ever you want on the filesystem (required for non-NT Windows application compatibility, and carried on to NT through poor education and practices by application writers) as the primary problem. If they had put a DOS/Windows 3.1/95/ME comparability mode that used something like chroot to isolate such application from the main OS, and enforced system directories that would never be written to by non-privileged applications for system libraries, utilities and DLLs, used specific User ID's (not Administrator) and directories as placeholders for applications, and made sure that nobody EVER installed NT using a FAT32 filesystem for C:, then I think that NT would have developed into a potent multi-tasking, multi-user OS. That did not happen and it's not where we are now.
BTW I am, and have been for over 30 years, a strong UNIX and latterly Linux advocate, but I do not let that blind me to the merits of other OS's, even if they are only potential.